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� � � � � Conventionally, 64-bit architecture based systems support only
32-bit (legacy) or 64-bit native mode (EFI 1.1) option ROMs but not both. As a
result, each platform looses a substantial number of supported add-in cards,
resulting in a loss of sales into the particular market associated with those
cards.

Description

� � � � � The disclosed method
supports both legacy 32-bit and EFI 64-bit native-mode option ROMs in a 64-bit
architecture-based system (see Figure 1). While in 32-bit emulation mode, all
option ROM contents are copied into a hand-off area visible to both 32-bit
emulation and 64-bit native mode code. In addition, an option ROM descriptor is
created. ROMs that contain legacy 32-bit images and no EFI images are copied
into shadow RAM, and the initialization code is executed.

� � � � � A flag in the
descriptor is set to indicate that the legacy image has been run. Before
leaving 32-bit emulation, the address and number descriptors is passed back to
the 64-bit processor, which then loads EFI. It examines the option ROM
descriptors for EFI 1.1 images. They are started as EFI initializes. It has
services available from both the EFI and legacy option cards. In addition , the
execution of both 32-bit legacy and 64-bit native mode option ROMs are
controlled with system BIOS set-up options.

� � � � � The disclosed method provides improved support for future
products. They will not be restricted by the set of supported add-in cards.
This is particularly important in the area of high performance RAID
controllers, which require that the number of excluded cards be minimized.

Advantages

� � � � � Some implementations of the disclosed structure and method
provide one or more of the follo...